They both love to travel, and guessing where they'll be next is always great fun. So stick Carmen Sandiego in the TARDIS as the Doctor's newest companion, and voila! Best-selling video game: Where in Time and Space is Carmen Sandiego? Armed only with a sonic screwdriver and your own knowledge of history and the universe (and Doctor Who trivia, perhaps?), unlock clues to follow the trail left behind by this daring duo!

Shut up. It sounded like an awesome idea when I was in the shower this morning.